Well, if that's how they did it then the telcos are even more un-security conscious than even I thought they were. It simply highlights my point.
There would be uproar if banks sent out debit or credit cards with default PINs yet the telcos see this as perfectly acceptable practice for their phone's voicemail.
Issuing phones with random voicemail PINs would hardly be rocket science. Oh, it would cost them a few bob to administer, which is what it boils down to.
As I say, none of this excuses the scum for exploiting such an obvious gap in security, but the stupidity of the telcos (and, it would seem, their governing body) is at best laughable and at worst commercially inept.
If you bought a new car with a default key to unlock it, who would you shout at the loudest when it was stolen? The car manufacturer or the car thief?
Astounding.